rs1554733324

Positions:

• chr9-109149711-A-G

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The ENST00000561981.5(FRRS1L):​c.248T>C​(p.Phe83Ser) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: FRRS1L ENST00000561981.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 8.64

Genes affected

FRRS1L (HGNC:1362): (ferric chelate reductase 1 like) This gene encodes a component of the outer-core of an alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptor protein in the brain. The encoded protein is thought to interact with inner-core components of the receptor, and play a role in the modulation of glutamate signaling. Mutations in this gene are associated with early infantile epileptic encephalopathy 37. [provided by RefSeq, Jul 2016]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
FRRS1L	NM_014334.4	c.248T>C	p.Phe83Ser	missense_variant	2/5	ENST00000561981.5	NP_055149.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
FRRS1L	ENST00000561981.5	c.248T>C	p.Phe83Ser	missense_variant	2/5	1	NM_014334.4	ENSP00000477141	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 28

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Developmental and epileptic encephalopathy, 37 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Oct 06, 2017

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated, but these predictions have not been confirmed by published functional studies and their clinical significance is uncertain. This variant has not been reported in the literature in individuals with FRRS1L-related disease. This variant is not present in population databases (ExAC no frequency). This sequence change replaces phenylalanine with serine at codon 134 of the FRRS1L protein (p.Phe134Ser). The phenylalanine residue is highly conserved and there is a large physicochemical difference between phenylalanine and serine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.98
BayesDel_addAF	Pathogenic	0.42	D
BayesDel_noAF	Pathogenic	0.37
CADD	Uncertain	25
DANN	Uncertain	1.0
DEOGEN2	Benign	0.017	T
Eigen	Uncertain	0.62
Eigen_PC	Pathogenic	0.68
FATHMM_MKL	Pathogenic	1.0	D
LIST_S2	Benign	0.81	T
M_CAP	Benign	0.0093	T
MetaRNN	Uncertain	0.68	D
MetaSVM	Benign	-0.63	T
MutationAssessor	Benign	1.8	L
MutationTaster	Benign	1.0	D
PrimateAI	Pathogenic	0.92	D
Sift4G	Uncertain	0.031	D
Polyphen		1.0	D
Vest4		0.80
MutPred		0.40		Gain of glycosylation at F134 (P = 0.0046);
MVP		0.59
MPC		0.17
ClinPred		0.95	D
GERP RS		5.8
Varity_R		0.62
gMVP		0.78

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.030		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs1554733324; hg19: chr9-111911991;